Attestations

An attestation represents a verified claim or statement in the Solana Attestation System. Attestations are created by authorized signers under a credential and follow a specific schema. Each attestation contains the actual data of the claim and metadata about its creation and validity.

Structure

The Attestation struct represents an attestation in the Solana Attestation System. Each attestation links to a credential, schema, and contains the attested data along with metadata about its creation and validity period.

Type Definitions

Attestation

export type Attestation = {
  discriminator: number; // Internal discriminator
  nonce: Address; // Unique identifier for the attestation
  credential: Address; // Associated credential address
  schema: Address; // Associated schema address
  data: ReadonlyUint8Array; // Attestation data
  signer: Address; // Address of the signer who created the attestation
  expiry: bigint; // Expiration timestamp
  tokenAccount: Address; // Associated token account
};

AttestationArgs

export type AttestationArgs = {
  discriminator: number;
  nonce: Address;
  credential: Address;
  schema: Address;
  data: ReadonlyUint8Array;
  signer: Address;
  expiry: number | bigint; // Can be either number or bigint
  tokenAccount: Address;
};

Methods

Fetching Attestations

Method	Description	Parameters	Returns
`fetchAttestation`	Fetches a single attestation by its address	`rpc`: RPC context, `address`: Attestation's address, `config?`: Fetch config	`Promise<Account<Attestation>>`
`fetchMaybeAttestation`	Safely fetches an attestation, returns null if not found	`rpc`: RPC context, `address`: Attestation's address, `config?`: Fetch config	`Promise<MaybeAccount<Attestation>>`
`fetchAllAttestation`	Fetches multiple attestations by their addresses	`rpc`: RPC context, `addresses`: Array of attestation addresses, `config?`: Fetch config	`Promise<Account<Attestation>[]>`
`fetchAllMaybeAttestation`	Safely fetches multiple attestations, skips not found	`rpc`: RPC context, `addresses`: Array of attestation addresses, `config?`: Fetch config	`Promise<MaybeAccount<Attestation>[]>`

Serialization

Method	Description	Parameters	Returns
`getAttestationEncoder`	Gets the encoder for attestation data	None	`Encoder<AttestationArgs>`
`getAttestationDecoder`	Gets the decoder for attestation data	None	`Decoder<Attestation>`
`getAttestationCodec`	Gets the codec for attestation data	None	`Codec<AttestationArgs, Attestation>`

Usage Examples

Fetching a Single Attestation

const attestation = await fetchAttestation(rpc, attestationAddress);
console.log("Attestation nonce:", attestation.nonce);

Fetching Multiple Attestations

const attestations = await fetchAllAttestation(rpc, [
  attestation1Address,
  attestation2Address
]);
attestations.forEach((attestation) =>
  console.log("Attestation:", attestation.nonce)
);

Safe Fetching

const attestation = await fetchMaybeAttestation(rpc, attestationAddress);
if (attestation) {
  console.log("Attestation found:", attestation.nonce);
} else {
  console.log("Attestation not found");
}

Important Notes

The discriminator field is used internally and should not be modified
The nonce provides a unique identifier for each attestation
credential and schema fields link the attestation to its associated credential and schema
The data field contains the actual attestation data and should be properly encoded/decoded according to the schema
signer must be one of the authorized signers of the associated credential
expiry determines when the attestation becomes invalid
tokenAccount links the attestation to a specific token account
Attestations can only be created by authorized signers of the associated credential
The attestation data must conform to the structure defined by the associated schema

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